Traits upgrade upper than 5

Hi
I got one legendary shooter with all his traits fully upgraded to level 5.
But there is still a promote button asking for 500 shooter card...
What is upgraded if I can manage to get 500 shooter card and click to this promote button as the level 5 for traits is the max isn't ?
I hope it is somehow clear enough....
Thanks for your answers.
I got one legendary shooter with all his traits fully upgraded to level 5.
But there is still a promote button asking for 500 shooter card...
What is upgraded if I can manage to get 500 shooter card and click to this promote button as the level 5 for traits is the max isn't ?
I hope it is somehow clear enough....
Thanks for your answers.
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